How to use babel installation and configuration tutorial
babel is a widely used transcoder that can convert ES6 code into ES5 code so that it can be executed in the existing environment. This article mainly introduces the use and installation configuration of babel. Friends who need it can refer to it
Introduction
babel is a widely used The transcoder can convert ES6 code into ES5 code so that it can be executed in the existing environment. This means that you can write programs in ES6 now without worrying about whether the existing environment supports it.
Installation and configuration
##npm install babel-cli --save-dev orcnpm install babel -cli --save-devUsing Taobao mirror installation will be faster.
Why not install it globally
If installed globally, it means that for the project to run, the global environment must have a babel, which means that the project has a dependency on the environment. On the other hand, this does not support different projects using different versions of Babel.Set transcoding rules
Install in the root directory: cnpm install babel-preset-es2015 --save-dev
{
"presets":[],
"plugins":[]
}{
"presets":["es2015"]
}Example demonstration:
Create demo.js in the project root directorylet a = 5; const b = 10; let input = [1,2,3]; input.map(item => item+1);
{
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-preset-es2015": "^6.24.1"
},
"scripts":{
"build":"babel demo.js"
}
}npm run build , check the results
{
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-preset-es2015": "^6.24.1"
},
"scripts":{
"build":"babel demo.js --out-file bunder.js"
}
}npm run buildRun, check the results
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